10月底，秋意渐浓，但河北省灵寿县王家沟村西面的山还是绿意盎然。天刚亮起，31岁的孙新娜来到山上，敲锣喂猪，捡鸡蛋，转到农场，忙碌的一天就开始了。
I am trying to use imshow in matplotlib to plot data as a heatmap, but some of the values are NaNs. I\'d like the NaNs to be rendered as a special color not found in the colormap.
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